US3814352A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reversing command modifier
Assignee: Bendix Corp
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Filing: 1973-04-17
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Granted: 1974-06-04
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Expires: 1993-04-17
Abstract
Abstract A reversing command modifier circuit for a composite beam and course steering command in an aircraft flight controller uses two operational amplifiers to prevent abrupt command signal changes from causing abrupt aircraft maneuvers and additionally allows the composite command signal to be inverted in polarity when desired. A first operational amplifier operates as a current supply in response to an input composite beam and course command signal for an integrating circuit which includes the second operational amplifier. The results of the integration comprise an output command signal which can be applied to position the aircraft control surfaces. A negative feedback loop turns off the constant current supply when the output command signal attains a predetermined value. In addition, a switching circuit permits the input composite command signal to be switched at the input of the first operational amplifier thereby reversing the polarity of the output command signal.
Inventors
- 👤 A Grimes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:40
CPC Classifications
G; G05; G05D; G05D1/00; G05D1/0055; G05D1/0066
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
275 words
A reversing command modifier circuit for delaying the application of a command signal from a first source of said command signal to means for positioning the control surfaces of an aircraft and for selectably determining the polarity of the command signal as delayed, comprising: a first operational amplifier having inverting and noninverting input terminals and an output terminal; a first resistive means for connecting said first source to said first operational amplifier inverting input terminal; second resistive means for connecting said first source to said first operational amplifier non-inverting input terminal; a second source of a relatively constant potential level; switching means for interrupting said second resistor means whereby said first source is disconnected from said noninverting input terminal and for simultaneously referring said non-inverting input terminal to said relatively constant potential level when said switching means is in a first state and for interrupting said first resistive means whereby said first source is disconnected from said inverting input terminal and for simultaneously referring said inverting input terminal to said relatively constant potential level when said switching means is in a second state; a second operational amplifier having an inverting input terminal, a non-inverting input terminal referenced to said relatively constant potential level and an output terminal; capacitor means connected between said second operational amplifier inverting input terminal and output terminal; third resistive means connecting said first operational amplifier output terminal and said second operational amplifier inverting input terminal; fourth resistive means connecting a point in said third resistive means with said relatively constant potential level; and, feedback resistance means connecting said second operational amplifier output terminal with said first operational amplifier non-inverting input terminal.
Claim 2
Dependent Claim
275 words
A reversing command modifier circuit for delaying the application of a command signal from a first source of said command signal to means for positioning the control surfaces of an aircraft and for selectably determining the polarity of the command signal as delayed, comprising: a first operational amplifier having inverting and noninverting input terminals and an output terminal; a first resistive means for connecting said first source to said first operational amplifier inverting input terminal; second resistive means for connecting said first source to said first operational amplifier non-inverting input terminal; a second source of a relatively constant potential level; switching means for interrupting said second resistor means whereby said first source is disconnected from said noninverting input terminal and for simultaneously referring said non-inverting input terminal to said relatively constant potential level when said switching means is in a first state and for interrupting said first resistive means whereby said first source is disconnected from said inverting input terminal and for simultaneously referring said inverting input terminal to said relatively constant potential level when said switching means is in a second state; a second operational amplifier having an inverting input terminal, a non-inverting input terminal referenced to said relatively constant potential level and an output terminal; capacitor means connected between said second operational amplifier inverting input terminal and output terminal; third resistive means connecting said first operational amplifier output terminal and said second operational amplifier inverting input terminal; fourth resistive means connecting a point in said third resistive means with said relatively constant potential level; and, feedback resistance means connecting said second operational amplifier output terminal with said first operational amplifier non-inverting input terminal.
Claim 3
Dependent Claim
26 words
The reversing command modifier of claim 1 wherein the resistance of said first resistance means is approximately equal to the resistance of said second resistance means.
Claim 4
Dependent Claim
74 words
The reversing command modifier of claim 1 wherein said switching means comprises a first field effect transistor having a source-drain circuit connected between a point in said first resistive means and said relatively constant potential level and having a first gate electrode, and a second field effect transistor having a source-drain circuit connected in said second resistive means and having a second gate electrode, said first and second gate electrodes being connected in common.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-03 | 1977-12-03 | 1978-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-03 | 1981-12-03 | 1982-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-03 | 1985-12-03 | 1986-06-04 | $7700.00 | Window Closed / Lapsed |